{"cve":"CVE-2026-50623","nvd":{"published":"2026-06-12T10:16:22.467","modified":"2026-10-25T23:10:00.167","status":"Modified","description":"An authentication bypass vulnerability exists in the OAuth2 TokenIntrospectionService in Apache CXF. Due to a missing 'throw' keyword in the security context check, the introspection endpoint (/services/oauth2/introspect) can be accessed by any unauthenticated network attacker. However note that this is a safeguard only in the case that someone forgot to enable authentication on the service. Users are recommended to upgrade to version 4.2.2 or 4.1.7 or 3.6.12, which fixes this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8},"cwes":["CWE-287"],"references":["https://lists.apache.org/thread/ydzj8m5mqmjy13xgyj9mkk9hfff63qq7","http://www.openwall.com/lists/oss-security/2026/06/11/3"],"products":["apache:cxf"],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-50623","score":0.00369,"percentile":0.30578,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-542g-m3fx-q86f","url":"https://osv.dev/vulnerability/GHSA-542g-m3fx-q86f","summary":"Apache CXF has Authentication Bypass in OAuth2 TokenIntrospectionService","modified":"2026-08-20T18:48:08.881180Z","packages":[{"ecosystem":"Maven","name":"org.apache.cxf:cxf-rt-rs-security-oauth2","purl":"pkg:maven/org.apache.cxf/cxf-rt-rs-security-oauth2","ranges":[">=4.2.0 <4.2.2"],"fixed":["4.2.2"]},{"ecosystem":"Maven","name":"org.apache.cxf:cxf-rt-rs-security-oauth2","purl":"pkg:maven/org.apache.cxf/cxf-rt-rs-security-oauth2","ranges":["<4.1.7"],"fixed":["4.1.7"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}